Island



(No Model.) 2 sheets-sheen 1.

C. H. FIELD & C. H. FIELD, Jr.

BNGRAVING MACHINE.

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(No Model.) I 2 sheetssheet 2.

c. H. FIELD .an G. HLPIELD, Jr. BNGRAVING MACHINE..

No. 461,745. Patented 001:. 2O, 1891.

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.support independently ot the adjustment of Uivrrn STATES I Finca.

ATENT CHARLES H. FIELD AND CHARLES I-I. FIELD, JR., OF PROVIDENCE,

RHODE ISLAND.

ENGnAvINc-MAHINE.

SPECIFICATION forming part of Letters Patent No. 461,745, dated October 20, 1891.

Application ned november 19, 1890.

To @ZZ whom, 25 may concern:

Be it known that we, CHARLES H.,FIELD and CHARLES I-I. FIELD, Jr., citizens ot' the United States, and residents of Providence, in the State of Rhode Island, have invented a new and'usefnl Improvement in Engraving- Machines, of which the following is a specilcation. s s Our invention relates to that class of engraving-machines in which an electro-magnet is employed to operate the graver in connection with a pattern and a tracer, the movement of which over the pattern serves to make and break the electric circuit at proper intervals; and it is a Well-known fact that when a sutiicient amount of electric current is employed to properly control the action of the graver a very deleterious spark will be produced at the instant of the separation of the contact-points, the same being especially deleterious when the contact is made and brok en at the surface of the pattern, and to practically reduce the said spark to a minimun constitutes one of the objects ot our invention; and heretofore in engravingmachines in which a cam is used to regulate the angular position of the graver to the curved form of the article to be engraved the support for the cam has been made separate and independent from the supporting-standard of the traversing block for the graver-carriage, thus necessitating an adjustmentof the said the position of the standard or frame which supports the said traversing block, thereby requiring eXtra time and care in making the proper adjustment of the separate parts; and our invention consists in the employment ot a short-circuit resistance- Wire with the coils of the electro-magnet which operates the graver, whereby the spark will be greatly lessened at the breaking of the electric circuit at the contact-points.

It also consists in the combination, with the graver and the graver-carriage, of the traversing block which supports the graver-carriage and a guiding-cam attached to the adjustable standard which supports the traversing block.

Serial No. 371,958. (No model.)

It also consists in the vimproved construction and arrangement of the tracer, which serves to transmit the required movement from the pattern to the levers which operate the contact-points.

It also consists in the combination, with the pattern, of a train of gearing whereby the pattern will be caused to revolve with a greater number of revolutions than the article to be engraved.

It also consists in the improved construction of the gear mechanism for operating the rosette pattern-wheel; and it also consists in improved devices for transmitting a simultaneous traversing movement to the tracer and the graver.

Figure l represents a plan view of an -en graving-machine embodying our improvements. Fig. 2 represents a side elevation ot' the same. the carriage-supporting standard removed. Fig. 4 is-a detail view showing the train of gears which serves to rotate the pattern. Fig. 5 represents a side elevation of the multiplying levers which serve to operate the contactpoints. Figs. G and 7 are detail views showing the construction of the tracer.

In the accompanying drawings, A represents the table of the machine; B, the vibrating t rame; C, the work-shaft or spindle, which is provided With means for holding the chuck I), on the end of which the metal-plate h tol be engraved or ornamented is secured.

The graver-carriage,standard is shown at E and is secured to the bed of the machine by means of a slot in its base and a clamping-screw a, which occupies a curved slot in the bed-plate, thusproviding for the' adjustability ot' the standard with relation to the'end of the work-spindle.

The traversing screw is shown at F, provided with a hand-crankj, a gearf, and a spring-pawl f, and is connected with the driving gearing mounted on the frame B by means of a shaft G, having universal joints, so that the screw F may be revolved regardless ot the particular position of the adjustable standard E. The spring-pawl f6 admits of the disconnection of the driving gearing Fig. 3 represents an end view with from the screw, which can then be revolved by its hand-crank, as set forth in Letters Patent of the United States No. 192,247.

H represents the traversing block dovetailed to the standard E and connected with the traversing screw.

I represents the graver-carriage, which is secured to the traversing block I-I by means of the dovetailed slide J, to which the supporting-plate K is pivoted at its forward end, the dovetailed slide J being fitted into a re cess in the traversing block, so that the said slide will move to and fro in a line at right angles to the axis of the traversing screw. The pivot b, which connects the slide J and the supporting-plate K, is preferably made hollow, so that the electric wire c, which forms a circuit around the arms of the electro-magnet L, may pass through the cavity of the said pivot. To the forward end of the supporting-plate K is pivoted the tool-post M, which serves to hold the graver d, the said tool-post being operated in a forward direction to bring the graver in contact with the plateV h for engraving the same by means of a spiral spring e, held in a cylindrical casef, attached to the standard g, which forms a connecting portion of the electro-magnet L and is attached to the supporting-plate K. The pivoted tool-post M is provided with the armature N, which, in connection with the electro-magnet L, serves to draw the graver back from the plate h against the opposing action of the spring e by means of which the graver is held against the said plate to perform its work. One edge of the supportingplato K'is provided with a projecting arm t', provided at its outer end with a roller j, which rides against the curved edge lc of the cam O, the said cam being supported in ahorizontal position by means of the arm Z, which projects from the standard E, and the rollerj is held against the edge ofthe cam O by means of the cord m, which passes over the pulley m and is provided with a weight, which is not shown in the drawings. The cam O being thus held in a fixed position relatively to the standard E, the movement of the traversing block H, b y means of the screw F, will cause the pivotal movement of the supporting plate K, which movementis required to maintain the proper direction of the graver from every part of the curved surface of the plate h, the general ajustment of the cam 0 being effected by the adjustment of the standard E upon the table A. l

To the standard E is attached the lever n by means of the screw 0, the end 1J of the said lever being attached to the end of the traversing block H by means of the adjustable link q, and to the traversing block is attached the lever r by means of the screw s, the said lever being provided with the cam -slot t, which is adapted to receive the roller u at the outer end of the lever n, and the inner end of the lever r is connected to the slide J by means of the link r, and by means of the camlever r a gradual forward movement and a corresponding backward movement will be imparted to the graver to provide for the curved surface of the plate 7i to be engraved.

The rosette pattern-wheel P is held loosely upon the spindle C bet-Ween suitable collars, the said wheel P being rotated by means ot' the attached gear Q, which engages with the pinion Q upon the end of the shaft R, upon which is placed the driving-pulley R and the driving-pinion S, which engages with the gear T, the said gear being held upon the sleeve U, which is provided with a flange .'r, against which the side of the gear rests, and upon the sleeve U is also placed the removable gear V,

which is held against the hub of the gear 'l y to revolve with the same by means of the nut y. Upon the spindle C are placed the sleeves V V2, which are caused to rotate with the spindle by means of the spline w, and are provided with the beveled surfaces e, which are adapted to engage with the corresponding beveled surfaces at the end of the cavity of the sleeve. The sleeve V is arranged to slide upon the spindle, and is adapted to be set up to compensate for the wear of the bearing-l sleeve U by means of the nuts w and we. Upon the rearward end of the spindle C is secured the removable gear lV, which has either one more teeth, or one tooth less than thc corresponding removable gear V, the gears V and WV being connected to each other by means of the equal pinions X X, which are secured to a short shaft d held in the adjustable bracket b. The rosette pattern-wheel P will thus be driven at a slightly greater or less speed than that of the spindle C, so that in one revolution of the rosette pattern-wheel there will be either a gain or loss of one-half of a wave of the said pattern-wheel. For example, with a rosette pattern-wheel having one hundred waves upon its periphery the gears V and W must have either two hundred and two hundred and one or two hundred and one hundred and ninety-nineteeth, respectively.

To the spindle C is attached the gear c', which is connected with the gear d upon the shaft e by means of the intermediate gear f the said gear d being made of the same diameter as the gear c in order that when the gear CZ is tightened upon the shaft e by means of the set-screw g the shaft e will be driven at the same speed as the spindle C; but in order to drive the shaft c at the rate of two, three, or four times the speed of the spindle C, as may be required, we provide upon the shaft e a pinion h', which may be tightened upon the shaft by means of the set-screw i', while the gear d is allowed to run loose, and upon the fixed stud j are loosely placed the gears 7c and Z', which are connected to each other, the gear 7c being made to engage with the pinion h', while the gear l will engage with the loose gear d', the gears shown in the drawings being adapted to cause the revolution of the shaftc twice as fast as the spindle IOC IIO

' arm being securedto the traversing block H,

C. Upon the end of the shaft e is secured the pattern-plate Y, which is provided ywith the pattern m2, the said pattern being made of sheet metal cnt out in the proper form, and soldered or otherwise secured to the face of the patternplate, so that the electric current can be made to pass through the said pattern to or from the contact-points.

Upon a slide n', arranged in front of the pattern-plate Y, is placed the insulated sliding holder o', which carries the tracer p andthe contact mechanism, and the said holder is caused to traverse upon the slide n in timely relation to the' traversing movement of the.

graver-carriage I, by means of the roller-covered pin q held in thecircular disk 7", which is secured to the downward-extending arm s by means of the clamping-screw t', the said so as to move therewith, and by turning the disk lr upon the clamping-screw t the position of the roller-covered pin q can be properly adjusted. 1

In a bearing u at the base of the standard A is held the rock-shaft v', one end of which is provided with the roller-covered arm w3,

which engages with the roller-covered pin q',

arm fr serving to impart the required trav-y ersing movement to thetracing-point, the roller-.covered arm w3 being held in contact with the side of the roller-covered pin q by means of a suitably-arranged spring or Weight (not shown in the drawings,) the said spring or weight being of sufcient strength to cause the backward movement of the holder o with the backward movement of the pin q.

The tracer p is provided with a conical point y2, which passes over the surface of the pattern-plate and pattern, and the movement of which over the elevations of the pattern, and theA vacant openings in the same, will serve to make and break the electric circuit at the contactpoints d2 a3, which are operated-by a system of compound levers, as follows: Over the tracer p is placed the loose supporting-sleeve b2, the end of which is beveled to correspond with the conical inclination of the point of the tracer, the said tracer being provided with the shoulder c2, which is adapted to be engaged by the shoulder c3 in the cavity of the sleeve h2, as shown in Figs. Gand 7, and the said sleeve'is arranged loosely in the adjustable shell cl2, which is securely held by means of the screw e2, the end f2 of the said shell serving to form a stop for the upper end of the lever g2, which is pivoted to the holder o at the pivot-pin h2, the said lever being provided with a perforation t2 to allow the outer end of the tracer p to press against the, upper end of the lever ,72, the said lever being provided with the ears k2, which are also pivoted tothe pin h2. A spring Z2 is attached to the holder o and arranged to bear against the lower arm of the lever g2, and to the opposite side of the lower arm of the said lever is attached the spring m3,'which bears against the lower arm of the lever 72, the pressure exerted by the spring Z2 being greater than that of the spring m3, and upon the upper arm of the lever g2 is placed 'the stop-screw n2, the head of which serves to limit the movement of the upper arms of the levers g2 and `7'2 toward each other. The upper arm of the leverj2 is provided with a forked guide 02, adapted to receive and guide the upper arm of the leverpi, which is pivoted to the lower arm of the lever c2-and connected with the lower end of the leverj2 by means of the pivoted link q2. The upper end of the lever t7'2 is provided with a head r2 of insulating material, having atransverse perforation to receive the contact-pin s2, which is held in proper adjustment by means of the clamping-screw t2, and the upper end of the lever p2 is provided with the metallic head u2, perforated transversely to receive the contact-pin S3, which is held in proper adjustment by means of the clampingscrew o2. The electric-circuit wire c runs from the top of the standard 002, to which it is attached, to the electric generator B', and

thence to the coils of the electro-magnet,

from which it passes to the contact-pin s2 of the insulated head r2 upon the lever j?, and from the point a4 in one 'arm of the circuitwire c to the point a4 in the opposite arm at each side of the magnet is extended the short-circuit resistance-wire ZJ, which, by allowing a current to pass at the breakingof the circuit, will serve to greatly diminish the spark at the contact-points.

In operating the machine the back of a watch-case or a curved plate h maybe attached to the chuck D at the forward end of the work-spindle C, and the proper adjustment of the graver-carriage standardE may be made by means of the clamping-screw4 aand the curved slot in the table A, through which the screw is made to pass, as set forth,and in this case, upon the proper movement of the traversing block H by means of the rotation of the traversing screw F, the action of. the cam O upon the armel will serve toguide the axis of the graver cl in a direct line toward the presented surface of the curved plate 7L without requiring aseparate adjustment of the cam O, as heretofore, and at whatever angle with the work-holding spindle C the standard E is set, the proper engagement will be iliade by the pin q and arm w3, whereby the movement of the traversing block H and the graver d will be transmitted to the sliding holder 0 and tracer p', and by the ad'- justment of the. pin q by turning the holding-disk r upon the clamping-screw t the traverse of the tracer p can be made to be either greater or less than that of the graver d, the pin q being thus caused to engage with the arm w3 at a greater or less distance from the rock-shafto, and the adjustable en- IOO IIO

gagement of the pin q and arm w3 for transmitting movement from the traversing block to the holderfor the tracing-point constitutes an important feature of our invention, the same being capable of operation at any desired position of the standard E upon the table. Upon the rotation of the pattern m2 and consequent engagement of the same with the point of the tracer, the points'a2a3of the contact-pins s2 and 33 Willbe moved in opposite directions to either make or break the circuit, as the case may be, the said contact-points being actuated in the opposite direction by means of the springs l2 and m3, and We prefer to pass the electric current through the pattern and tracer, as by means of the electric-wire connections hereinbefore described.

It is intended that the beveled end of the tracer-supporting sleeve b2 shall touch at the highest surface of the pattern, and in case of inequalities in such surface the said sleeve will operate to move the contact-points backward together, so that under all circumstances the distance through which the contact-points are caused to separate from each otherwill be the same, and by our improvement a very quick movement for making and breaking the circuit will be attained, which Will insure the highest grade of Work.

In making what is known as barleycorn engraving the Work-spindle C is made to have a Vslight vibratory movement by the rotation ot` the rosette pattern-Wheel P against.

the fixed guide-rest b3, and the arrangement of the removable gears V and XV with the rosette pattern-wheel P upon the same spindle C constitutes an economical construction and a desirable improvement.

Te claim as our inventionl. In an engraving-machine, the combination, with the graver and an electro-magnet which is adapted to operate the graver, of a short-circuit resistance-Wire arranged to connect the Wire ot` the electric circuit in advance of the coils ot' the magnet, whereby the tendency to throw oft" a spark at the contactpoints upon the breaking of the circuit will be diminished, substantially as described.

2. In an engravingmachine, the combina tion, with the graver, the graver-carriage, and the traversing block, of the adjustable standard supporting the traversing block and provided With a cam which is adapted to guide the direction of the graver relatively to the curved surface of the plate to be engraved, substantially as described.

3. In an engraving-machine, the combination, with the pattern, of the sliding tracer, the electric contact-points, and operative connection from the sliding tracer to the contactpoints, whereby the mechanical action of the pattern upon the tracer will he imparted to the contact-points, substantially as described.

et. In an engraving-machine, the combination, with a pattern and a tracer arranged in electric circuit with the pattern, of the contact-points and supporting-levers which are actuated to move simultaneously in opposite directions by the mechanical action of the pattern upon the tracer, substantially as described. v

5. The combination, with the electro-magnet, the contact-points adapted to make and break the electric circuit, of a pattern and tracer, and suitable connect-ion for imparting a simultaneous opposite movement to the contact-points, as set forth. v

6. In an engraving-machine, the combination, with the pattern, the tracer, and the -tracer-supporting sleeve, of the contact-points and su pporting-levers, which are actuated to move simultaneously in opposite directions by the mechanical action ot the pattern upon the tracer, and are actuated to move together in the same direction by the mechanical action of the pattern upon the tracer-supporting sleeve, substantially as described.

7. In an engraving-machine, the combination, with the pattern and the sliding tracer, of the lever which carries one of the contactpoints for making and breaking the circuit and is operated by the movement of the tracer, and the lever which is linked to the said tracer-operated lever and carries the opposite contact-point, substantially as described.

8. In an engraving-machine, the combination, with the pattern and the sliding tracer, of the lever which carries one of the contactpoints and is operated by the movement of the tracer, the tracer-sleeve, the lever which is operated by the movement of the tracersleeve, the stop for limiting the movement ot' the tracer-sleeve toward the pattern, and the lever which is jointed to the said-sleeveoperated leve-r and linked to the said traceroperated lever and carries the opposite contact-point for making and breaking the cloctric circuit, substantially as described.

9. In an engraving-machine, the combination, With the Work-holding spindle, of the revolving pattern which is geared to rotate at a different rate of speed from that of theworkholding spindle, the tracer arranged in electric circuit with the pattern, means, substantially as described, for making and breaking the electric circuit by the mechanical action of the pattern upon the tracer, the gravel', the electro-magnet for operating the graver, and means for causing the simultaneous traversing movement of the graver and the tracer, substantially as described.

l0. In an engraving-machine, the combination, with the work-holding spindle, of the rosette pattern-wheel loosely held upon the spindle, the loose sleeve provided with the gears, one of which is removable, the removable gear attached to the Work-spindle and having one more or one less number of teeth than the removable gear of the sleeve, means for connectedly driving the rosette patternwheel and the gears upon the sleeve, and

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means for oonueetedly driving the removable the tracer, and means for imparting move-` 1o gears of the sleeve and spindle,substantially ment from the rook-shaft to the holder, subas and for the purpose specified. stantally as described. 11. In an enUravinff-maehine the oombina- 1 i 5 tion, with the lrebverzsing block7 and the ad- JR j ustable projecting pin adapted to move with J the traversing' block, of the roekshaft pro- Vitnesses: vided with a, projecting alim Which engages S. SCHOLFIELD,

with the said projecting pin, the holder for H. S. BABCOCK. a 

